The report on the GL18N compared to the Kai on the 1st test session (in 2-3' mush) was just an "eh, not so much".

Going to shim the rear screw to try to get a little more lift, and/or possibly move the whole foil forward just a just. But on said first test, no matter how hard I tried to push it, I never could get it over 12.4 mph (almost like it had a governor on it), when with the Kai, 12-15 mph was a no brainer on it depending on what I was trying to do on the wave.

Heading out for test session number two....but after seeing this........Austin on what appears to be a GL front w/ the Kai tail in this video...

I will be sad if they stop selling the 18 Narrow tail. I almost bought another one to CUT it down further.

My take is that it has slightly MORE downforce at speed than the KAI tail BUT it is faster. The KAI tail also introduced a bizzare buffeting. It was vibrating but NOT humming when pushed hard at speed.